Think of them as a floating hospital if you may - but the U.K.-based Mercy Ships is designed to be the world's answer to effective crisis response at sea. The international Christian humanitarian organization deploys ocean-going vessels as hospitals and relief and development vehicles with a goal it hopes to reach by 2005 of serving one million people. Believed to be one of the largest individual gifts given to a Christian charity in the U.K. - a donation of $6.4 million was recently granted to the organization for the purchase of another vessel for its good Samaritan fleet. This good-will gesture offered by Ann Gloag, executive director of Stagecoach Holdings plc, will go toward Mercy Ships' purchase of Dronning Ingrid -a 16,071-grt Scandlines train and car ferry.